Mixing apparatus



Nov. 25, 1 930. A. B. SMITH ET AL 1,782,795

MIXING APPARATUS Filed Sept. 7, 1929 2 SheetS -Sheet '1 be mixed andmixing arms or blades carried the pan.

Patented Nov. 25, 1930, I

UNITED STATES mC j .ALFRED nanrrmrrsmrnnnn CLIFFORDlndSsfstrrtinforattainments;

MIXING Arrnnnirnsf H'TJ,

Application filed September 7, 1929, Se No. 3230,913, and in GreatBritain March 22,1929.

This invention relates to improvements in mixing apparatus and refersparticularly to mixing apparatus of the type comprisinga cylindrical panto receive-the materials to by a vertical spindle passingthroughthecentre of the pan.

The spindle is frequently driven through gearing enclosed in a casingbelow'the pan. In some cases the drive may be overhead but as a' rulethere is at least one bearing below One of the uses of under treatmentgetting into the bearings or gearing of the machine.

p The entry of this material into any of the hearings or into thegearing causes rapid wear and so reduces the working life ofthe machine.

The objects of the present improvements are to provide means forpreventing the entry of such materials into the hearings or gearing ofthe machine and to arrange for the discharge clear of the machine of anymaterial which may pass overthe inner lip of the pan.

We accomplish these objects by the. means illustrated in the appendeddrawing, in s which is raised into, or provided with, a conical orFigure 1 is a perspective view partly in section of a preferred type ofmachine with the invention applied thereto; and Figure 2 is a plan viewthereof.

(tie the standard or base of the machine, 6 the container pan, 0 fixedmixing blades or pressure surfaces secured to the pan, 0! the rotarymixing blades carried by the vertical shaft 6 driven by the drivingshaft f. The

standard or base a encloses the gearing and lower bearing for thevertical shaft 6 of the machine.

The upper end of the standard or casing a domed protector plate 9 andthe base it of the pan 6 which is supported on the standard is cast orotherwise provided with a number of spaced: feet z or ribs leavingbetween them machinesof this type is for preparing sand forfoundry'purposes,

' wall of said pan.

thestandard so as to spacethe base it of the panb abovethe conical plateg. i .A;t;the centre, the protector'plate or sur face 9 has,annpstanding collar orsleeve jlaround they'ertical shaft e, fland' therotor orboss-iqkeyed onthe shaft,and carrying the rotary arms cl, has adepending skirt on; fitting over this collar; suitable packing can beinserted, ifydesired. v

I-fQany of the material under treatmentin the pan biflows overthelip nofthe inner, upstanding wall of the pan which'surrounds theshaft, itfallsonto the conical or. domed protector, g and {passes away throughthe spaces orpassagestwhich are left between this top and the baseh ofthe pan by the feet 1,, and is dischargedyoutside the standard or'casingaofthe nachinen W6 0 1 1 7 "1: l i l Apparatus "for "treating finely ldivided materials comprising in combination a pan or container, a shaftrotatable about a vertical axis therein and carrying means for treating?the materials in the pan, driving means for the shaft, an upstandinginner wall on the pan around the shaft, a protecting surface surroundingthe shaft below said upp a standing inner wall of said pan, and meansfor spacing the base of the pan away from said protecting surface toform discharge passages for leading outside of the machine any materialswhich may overflow the inner 2. Apparatus for treating finely dividedmaterials comprising a pan or container, a rotatable shaft thereln,carrying means for treating the materials, driving means for the shaft,an upstanding inner wall of the pan around the shaft, means forprotecting the shaft" below said upstanding inner wall of the pan, andmeans consistingof feet on the base of the pan for spacing said basefrom said protecting means and forming discharge passages leadingoutside the machine any materials which may overflow the inner Wall ofthe pan. 7 s t 3. Apparatus for treating finely divided 3 materialscomprising in combination a pan or container, a shaft rotatable about avertical axis therein and carrying means for treating the materials inthe pan, driving means for the shaft, an upstanding inner wall on thepan around the shaft,'a protecting surface surrounding the shaft belowsaid upstanding Wall on said pan, said surface being of conical form andcompletely roofing over the lower part of the machine, and means forspacing the base of the pan from said surface consisting of a series offeet on the base of the pan so that discharge passages leading outsidethe machine are thereby formed for any materials which may escape overthe inner wall of the pan.

4. Apparatus for treating finely divided materials, comprising incombination a standard supporting a container pan, a vertical shaftmounted in said standard, driving gear therefor within said standard,said shaft projecting centrally into the container pan and having mixerblades secured upon it within the pan; an inner wall on the base of-thepan surrounding the shaft below the attachment of the mixer blades, acollar on-said shaft for carrying the blades, said collar having adepending skirt, a raised protecting surface on said standardsurrounding the vertical shaft below the inner wall of the pan, anupstanding part on said surface around said shaft overhung by the skirton said bladecarrying collar, and stepped feet on the base of the panresting on said standard and spacing the pan away from said raisedprotecting surface to form discharge passages leading outside themachine any materials which may overflow the inner wall of the base ofthe pan.

In testimony whereof we affix our signatures. 1

ALFRED BARTLETT SMITH.

CLIFFORD ROSS SMITH.

